Case C-263/06: Judgment of the Court (Fourth Chamber) of 28 February 2008 (reference for a preliminary ruling from the Corte suprema di cassazione, Italy) — Carboni e derivati Srl v Ministero dell'Economia e delle Finanze, Riunione Adriatica di Sicurtà SpA (Common commercial policy — Protection against dumping — Anti-dumping duty — Hematite pig iron originating in Russia — Decision No 67/94/ECSC — Determination of customs value for purposes of the application of a variable anti-dumping duty — Transaction value — Successive sales at different prices — Whether the customs authority may take into consideration the price indicated in a sale of goods effected prior to that on the basis of which the customs declaration was made)